Exhaust cleaning system

ABSTRACT

A main body of exhaust cleaning system 15 is arranged in a hood 8 that is connected to an exhaust duct 14 at an upper part and is opened at a bottom face. A grease filter 23 is arranged at a side plate of a main body case 18 having an inlet 19 into which an exhaust air 5 flows. A filter 33 formed in an endless belt shape by gathering stainless steel wires and the like is attached to rotary shafts 25a, 25b provided to freely rotate in the main body case 18. The filter 33 adheres to the grease filter 23 and a discharge opening 10 through which the exhaust air 5 flows, and is partially immersed in a cleaning liquid 40 in a cleaning liquid tank 22 provided at a lower part of the main body case 18. The exhaust air 5 flowing from the inlet 19 through the grease filter 23 is flown through the rotationally moving filter 33, is flown again from a space 36 through the filter 33, and is discharged after being cleaned. A cleaning of the exhaust air 5 and a cleaning of the filter 33 can be done at a time.

TECHNICAL FIELD

The present invention relates to an exhaust cleaning system using afilter for clarifying and discharging an exhaust air containingcontaminants generated from a restaurant, a home kitchen, combustionfacilities, crushing facilities, etc..

BACKGROUND ART

Conventionally, as exhaust cleaning systems using filters for clarifyingand discharging exhaust air containing oily steam and dust generatedfrom the kitchens used at food supply facilities of hotels, restaurants,Tempura restaurants and Yakitori restaurants and home ventilation fans,and exhaust air containing contaminants generated from incinerationfacilities at waste incineration plants, crushing facilities of quarriesand clinker calcination facilities of cement plants, variouscompositions are known. With regard to exhaust cleaning systems providedat kitchens, for example, compositions shown in FIGS. 20 and 21 areknown.

A kitchen systems shown in FIGS. 20 and 21 employs a composition that anexhaust cleaning system 205 having a filter 204, such as a grease filteror a grease separator, for separating and removing tarry matterscontaining oil/grease and dust from an exhaust air 203 is arranged in abellmouth-shaped hood 202 expanding downward that is connected to anexhaust duct 201, which is connected to the outdoors and stores a fan,and is arranged in a ceiling.

The filter 204 is, as provided by the Fire Service Law and varioustechnical standards, formed with a stainless steel sheet, or anoncombustible material having a heat resistance and a corrosionresistance equal to or higher than those of the stainless steel sheet.In addition, the filter 204 is, as shown in FIG. 22 through 25, formedas a louver structure which a rapid directional conversion andcontraction in air flow that occur when the exhaust air 203 flowsthrough. And by a rapid directional conversion and contraction in airflow an oil/grease content in the exhaust air 203 touches a wall surfaceand an oil content exceeding a prescribed quantity is removed. Further,the filter 204 is arranged with a formation facilitatingmounting/dismounting so that a deposited oil/grease can easily be washedoff by separation. Underneath the filter 204, a trough 207 forcollecting an oil/grease that flows through along an inner wall surfaceprovided around a bottom part of the hood 202, and a trough 208 forcollecting a prescribed quantity or more of the separated oil/grease andremoving the same outside the hood 202 are provided. Additionally, theexhaust cleaning system 205 is arranged in the hood 202 such that aplain of the filter 204 is approximately 45 degrees tilted inconjunction with a horizontal plain so as to surely collect anoil/grease without causing dropping to a combustion system 210 and afire source 211 in a kitchen.

Meantime, in the case of the exhaust cleaning system 205 having thefilter 204 with the louver structure as shown in FIG. 22 through 25, anoil/grease content in the exhaust air 203, when it exceeds theprescribed quantity, flows out and is collected by troughs 207 and 208arranged at the lower part. However, in the case of the filter 204 withthe louver structure, when the exhaust air 203 contains a tar mattercontaining dust, the oil/grease content becomes stagnant due to anincrease in viscosity, causing a decrease in flowability of the exhaustair 203 and in separation/removal efficiency. Also, as a noise, such asan air sound, is generated, a cleaning operation of the filter 204 usingan alkali detergent must be done frequently particularly in anenvironment containing a lot of oil/grease. Further, an oil/greasecontent that is not removed and flows through the filter 204 deposits toan inner wall surface of the exhaust duct 201, degrading itsexhaustibility, and the oil/grease deposited to the inner wall surfaceof the exhaust duct 201 adheres in a tar form due to a deposit of dust.Moreover, since this tar formed oil/grease requires a troublesomeremoval operation and involves a danger of ignition when it is oxidized,a troublesome cleaning operation of the exhaust duct 201 must be done.This increases a cleaning cost.

Also, when a fire prevention system, such as a fire damper or a fireextinguishing system having fire nozzles, is arranged in the exhaustduct 201, an oil/grease content that is not removed and flows throughdeposits and might hinder a fire extinguishing operation. Sincemaintenance is troublesome, a problem is an increase in maintenancecost.

To cope with this, conventionally, contaminants is separated and removedby spraying a cleaning detergent to a flowing exhaust air, contaminantsdepositing to the filter 204 is washed off by spraying a cleaningdetergent to the filter 204, or a grease extractor providing anautomatic cleaning function such as to separate and remove contaminantsby flowing an exhaust air through a cleaning detergent or water is used.

However, in the case of a grease extractor providing an automaticcleaning function with a composition such that a cleaning liquid issprayed or is blown to the filter 204, it is necessary to collect aneffluent containing a washed oil/grease that flows through inside theexhaust duct 201 or nozzle for spraying or blowing without disturbing aflow of the exhaust air 203. The structures are complicated, making theproduction complicated and expensive and the system becomes a largescale. Further, in the case of a composition by which an exhaust air isflown through a cleaning liquid or water, it is necessary to take a longtime for contact with a cleaning liquid or water to increase a removalrate, which poses a problem that a large air path resistance isgenerated and it is not possible to efficiently clean the exhaust air.

Also, because of a fixed composition to be attached to the hood 202,when cooking using oil is done at a center of a kitchen, for example, acollection rate of an evaporated oil/grease absorbed from the hood isextremely decreased, posing a problem of a degradation in a cookingenvironment.

Further, in a household environment containing an evaporated oil/greasea little, a problem is a difficulty to secure a space to arrange thehood 202 into which the exhaust cleaning system 205 is attached.

It is an object, therefore, of the present invention to provide anexhaust cleaning system of which a cleaning of a filter, that is soiledby cleaning exhaust air, is almost unnecessary and a maintenance is madeeasy: an exhaust cleaning system that can efficiently clean exhaust air;an exhaust cleaning system with a simple composition that can easily beproduced; an exhaust cleaning system that can thoroughly cleanparticularly an exhaust air containing oil/grease; an exhaust cleaningsystem that can be moved as required by a style of use; and a compactexhaust cleaning system suitable for a use environment.

SUMMARY OF THE INVENTION

An exhaust cleaning system of the present invention is provided with amain body having an exhaust inlet into which an exhaust air flows and anexhaust outlet from which said exhaust air is discharged: a permeablefilter, arranged in the main body, for passing said exhaust air thatflows in from said exhaust inlet and discharging the same from saidexhaust outlet; a cleaning means for cleaning at least a part of thefilter with incombustible, and vegetable cleaning liquid; and a movingmeans for moving said filter to change a cleaning position of saidfilter to be cleaned by said cleaning means.

An exhaust air that flows from the exhaust inlet into the main body isseparated and removed of contaminants in the exhaust air that are caughtby the permeable filter while passing through the filter that isarranged in the main body and moved by the moving means, and since thecontaminants caught by the filter are washed off when the filter iscleaned with an incombustible, vegetable cleaning liquid at leastpartially by its cleaning position being changed by the moving means.

Therefore, an exhaust air that flows from the exhaust inlet into themain body is separated and removed of contaminants in the exhaust airthat are caught by the permeable filter while passing through the filterthat is arranged in the main body and moved by the moving means, andsince the contaminants caught by the filter are washed off when thefilter is cleaned with an incombustible, vegetable cleaning liquid ofcleaning means being changed by the moving means, cleaning operation arenearly automated, the exhaust air is efficiently cleaned and maintenanceis made easy and it is easy to handle easily to treat cleaning liquidcontaining pollutants that have been removed from exhaust air, and canbe used in an atmosphere receiving a heat load.

Furthermore, the invention has a main body having an exhaust inlet towhich exhaust air of said invention flows in and an exhaust outlet fromwhich said exhaust air is discharged, a permeable filter is fitted tothe main body and from which said exhaust air flown in through saidexhaust inlet is flown out, a cleaning mean to clean at least a part ofthe filters by using a cleaning liquid containing a main component ofamine soap made from tallol as a material and a higher alcoholicnonionic surfactant, and moving means to change the position ofcleaning--by said cleaning means--of said filters by moving saidfilters. Next, pollutants contained in exhaust air is caught with thefilters to separate and remove, when the exhaust air flew in the mainbody from the exhaust inlet flows through permeable filters, that isfitted inside the main body and moved by moving mean, is discharged fromthe exhaust outlet of the main body. In addition, pollutants caught withthe filters are cleaned by cleaning means with a cleaning liquidcontaining amine soap as the main component made from tallol as thematerial and a higher alcoholic nonionic surfactant with a change ofcleaning position of at least a part of filters by moving means.Therefore, exhaust air flew in the main body through the exhaust inletflows through moving porous filters in the main body and is dischargedfrom the exhaust outlet of the main body to catch pollutants containedin the exhaust air with the filters followed by separation and removal.The pollutants caught with the filters are cleaned by cleaning meanswith a cleaning liquid containing amine soap as the main component madefrom tallol as the material and a higher alcoholic nonionic surfactantwith a change of the position of filters movable by moving means. Thus,cleaning work can be automated to make cleaning of the exhaust airefficiently, maintenance and management can be easily done, easytreatment, incombustibility, easy handling, and a higher cleaningperformance can be realized, and the exhaust air can be cleaned well,efficiently, and stably for along time. Furthermore, an exaust, anexhaust cleaning system of the present invention is an exhaust cleaningsystem as claimed in the above invention, wherein the cleaning means hasa cleaning liquid and provided with an injection unit for injection saidcleaning liquid to a part of the filter.

And cleaning is done by injecting the cleaning liquid to the filter bythe injection unit of the cleaning means.

Therefore, since cleaning is done by injecting the cleaning liquid tothe filter by the injection unit of the cleaning means, automation ispossible with a simple composition and filter cleaning can be doneeasily.

Further, an exhaust cleaning system of the present invention is providedwith a main body having an exhaust inlet into which an exhaust air flowsand an exhaust outlet from which said exhaust air is discharged; apermeable filter arranged in the main body and covering said exhaustoutlet; a cleaning means for storing an incombustible, vegetablecleaning liquid in which at least a part of the filter is immersed:: anda moving means for moving said filter to change a cleaning position ofsaid filter to be cleaned by said cleaning means.

And an exhaust air that flows from the exhaust inlet into the main bodyis separated and removed of contaminants in the exhaust air that arecaught while passing through the permeable filter that is arranged inthe main body and moved by the moving means, and the filter is moved bythe moving means and is immersed at least partially in theincombustible, vegetable cleaning liquid of the cleaning means by itsposition being changed to wash off contaminants caught.

Therefore, since an exhaust air that flows from the exhaust inlet intothe main body is separated and removed of contaminants in the exhaustair that are caught while passing through the permeable filter that isarranged in the main body and moved by the moving means, and the filteris moved by the moving means and is immersed at least partially in theincombustible, vegetable cleaning liquid of the cleaning means by itsposition being changed to wash off contaminants caught, cleaningoperations are nearly automated, the exhaust air is efficiently cleaned,and maintenance is made easy and it is easy to handle easily to treatcleaning liquid containing pollutants that have been removed fromexhaust air, and can be used in an atmosphere receiving a heat load.

In addition, the invention has a main body having an exhaust inlet towhich exhaust air of said invention flows in and an exhaust outlet fromwhich said exhaust air is discharged, permeable filters fitted to themain body cover said exhaust outlet, a cleaning mean to store a cleaningliquid containing a main component of amine soap made from tallol as amaterial and a higher alcoholic nonionic surfactant and to immerse atleast a part of the filters, and moving means to change the position ofcleaning--by said cleaning means--of said filters by moving saidfilters. Next, pollutants contained in exhaust air is caught with thefilters to separate and remove, when the exhaust air flown in the mainbody through the exhaust inlet flows through permeable filters, that isfitted inside the main body and moved by moving means, is dischargedfrom the exhaust outlet of the main body. In addition, the filtersmovable by moving means clean away the pollutants, that have beencaught, are ommersed in a cleaning liquid of cleaning means containingamine soap as the main component made from tallol as the material and ahigher alcoholic nonionic surfactant with a change of the position of atleast a part of the filters. Therefore, exhaust air flew in the mainbody through the exhaust inlet flows through moving porous filters inthe main body and is discharged from the exhaust outlet of the main bodyto catch pollutants contained in the exhaust air with the filtersfollowed by separation and removal. The filters are moved by movingmeans to clean away the pollutants, that have been caught, by immersingin an incombustible, vegetable, cleaning liquid of cleaning means with achange of the position of at least a part of the filters. Thus, cleaningwork can be almost automated to make cleaning of the exhaust airefficiently, maintenance and management can be easily done, easytreatment, incombustibility, easy handling, and a higher cleaningperformance can be realized, and the exhaust air can be cleaned well,efficiently, and stably for a long time. Furthermore, an exhaustcleaning system of the present invention is an exhaust cleaning systemaccording to the above invention, wherein since the moving means isintended to move the filter while covering the exhaust outlet and thefilter is moved while covering the exhaust outlet.

And the filter is moved while covering the exhaust outlet by the movingmeans.

Therefore, since the filter is moved while covering the exhaust outletby the moving means, it is possible to prevent a harmful effect, such asclogging, due to contaminants in the exhaust air being caught by thesame surface, and since composition is simplified, filter cleaning ismade easy and a catching of contaminants in the exhaust air and filtercleaning can be done at a time, both a cleaning efficiency of theexhaust air and that of the filter are improved.

Furthermore, an exhaust cleaning system of the present invention is anexhaust cleaning system according to the above invention, wherein theexhaust air is to be flown through the filter at least twice.

And the exhaust air is to be flown through the filter at least twice.

Therefore, since the exhaust air is flown through the filter at leasttwice, a removal rate of contaminants in the exhaust air is improved andit is able to clean the exhaust satisfactory.

Furthermore an exhaust cleaning system of the present invention is anexhaust cleaning system as claimed in the above invention, wherein thefilter is formed as an endless belt.

And the filter is formed as an endless belt.

Therefore, since the filter is formed as an endless belt, a freedom offilter arrangement is increased, productivity is improved, and a compactdesign is easily applicable.

And an exhaust cleaning system of the present invention is an exhaustcleaning system according to the above invention, wherein the movingmeans is intended to rotationally move the filter.

Further, the invention has filters--of said invention--that has beenformed in a near cylindrical shape having an inside space.

The filters are made to have a near cylindrical shape with an insidespace. Thus, the filters made to have a near cylindrical shape with aninside space allow easy cleaning of the filters efficiently andsimplification of the structure of the cleaning means and also easilyallow the structure to improve cleaning efficiency by flowing exhaustair through the filters in plural frequencies. Further, in theinvention, the moving means of said invention have a filter holding partto hold filters and driving means to move the filter holding part.

The filter holding part is moved by driving means. Therefore, The filterholding part holding filters and movable by moving means allows to moveeasily the filters keeping shape, prevent a damage of filters caused bya load in moving, and clean the exhaust air efficiently for a long time.

Furthermore, the moving means is intended to rotationally move thefilter.

Therefore, since the filter is moved rotationally by the moving means, aspace required for moving the filter is small, and a compact design iseasily applicable.

An exhaust cleaning system of the present invention is an exhaustcleaning system according to the above invention, wherein the movingmeans is provided with a frame-shaped filter holding part for holdingthe filter and a driving means for rotationally moving the filterholding part.

And the frame-shaped filter holding part holding the filter isrotationally moved by the driving means.

Therefore, since the frame-shaped filter holding part holding the filteris rotationally moved by the driving means, a space required for movingthe filter is small and a compact design is applicable, filter caneasily be moved while maintaining its shape as is, thereby preventing adamage of the filter due to a load during movement, filtermounting/dismounting is made easy, productivity is improved, andmaintenance is made easy.

Furthermore, in the invention the cleaning means of said invention hasultrasonic cleaning means to clean ultrasonically the filters, that isimmersed in cleaning liquid. The filters immersed in cleaning liquid areultrasonically cleaned by ultrasonic cleaning means. Thus, theultrasonic cleaning of the filters immersed in the cleaning liquid byultrasonic cleaning means allows to improve cleaning performance andclean the exhaust air efficiently for a long time. Furthermore, thepresent invention. Furthermore, the invention" of the line 3 of the page7 of specification to "Furthermore in the invention the cleaning meansof said invention has ultrasonic cleaning means to clean ultrasonicallythe filters, that is immersed in cleaning liquid. The filters immersedin cleaning liquid are ultrasonically cleaned by ultrasonic cleaningmeans. Thus, the ultrasonic cleaning of the filters immersed in thecleaning liquid by ultrasonic cleaning means allows to improve cleaningperformance and clean the exhaust air efficiently for a long time.

Furthermore, the present invention is provided with a main body havingan exhaust inlet into which an exhaust air flows and an exhaust outletfrom which said exhaust air is discharged; a permeable filter, arrangedin the main body, for passing said exhaust air that flows in from saidexhaust inlet and discharging the same from said exhaust outlet; acleaning means having an injection unit for injecting an incombustible,vegetable, cleaning liquid to the filter and cleaning at least a part ofthe filter; and a moving means for moving said injection unit of thecleaning means to change a cleaning position of said filter.

And an exhaust air that flows from the exhaust inlet into the main bodyis separated and removed of contaminants in the exhaust air that arecaught by the permeable filter while passing through the filter that isarranged in the main body and moved by the moving means. Furthermore,since the contaminants caught by the filter are washed off when thefilter is cleaned by its cleaning position being changed by theinjection unit of the cleaning means that injects the incombustible,vegetable, cleaning liquid to the filter and is moved by the movingmeans.

Therefore, since an exhaust air that flows from the exhaust inlet intothe main body is separated and removed of contaminants in the exhaustair that are caught by the permeable filter while removed ofcontaminants in the exhaust air that are caught by the permeable filterwhile passing through the filter that is arranged in the main body andmoved by the moving means and the contaminants caught by the filter arewashed off when the filter is cleaned by its cleaning position beingchanged by the injection unit of the cleaning means cleaned by itscleaning position being changed by the injection unit of the cleaningmeans that injects the cleaning liquid to the contaminants by the movingmeans, cleaning operations are nearly automated, the exhaust air isefficiently cleaned, and maintenance is made easy and it is easy tohandle easily to treat cleaning liquid containing pollutants that havebeen removed from exhaust air, and can be used in an atmospherereceiving a heat load.

Besides, the invention has a main body having an exhaust inlet to whichexhaust air of said invention flows in and an exhaust outlet from whichsaid exhaust air is discharged through permeable filters fitted to themain body to flow out said exhaust air, that flew in from said exhaustinlet, by flowing through said exhaust outlet, cleaning means having aninjection unit to clean said filters by injecting a cleaningliquid--containing a main component of amine soap made from tallol as amaterial and a higher alcoholic nonionic surfactant--to at least a partof the filters, and moving means to change the position of cleaning ofsaid filters by moving said injection unit of the cleaning means. Next,pollutants contained in exhaust air is caught with the filters toseparate and remove, when the exhaust air flew in the main body throughthe exhaust inlet flows through permeable filters--fitted inside themain body--discharges from the exhaust outlet of the main body. Inaddition, the pollutants--caught by the filters--are cleaned away bycleaning by changing a cleaning position of the filters by moving theinjection unit of cleaning means to inject a cleaning liquid to thefilters--containing amine soap as the main component made from tallol asthe material and a higher alcoholic nonionic surfactant--by moving meanswith a change of the cleaning position of the filters. Therefore, theexhaust air flew in the main body through the exhaust inlet flowsthrough porous filters in the main body and is discharged from theexhaust outlet of the main body to catch pollutants contained in theexhaust air with the filters followed by separation and removal.Pollutants caught by the filters are cleaned away by changing theposition of the injection unit of the injecting means to inject thecleaning liquid--containing amine soap as the main component made fromtallol as the material and a higher alcoholic nonionic surfactant--tothe filters by moving means. Thus, cleaning work can be almost automatedto make cleaning of the exhaust air efficiently, maintenance andmanagement can be easily done, easy treatment, incombustibility, easyhandling, and a higher cleaning performance can be realized, and theexhaust air can be cleaned well, efficiently, and stably for a longtime. On the other hand, in the invention the injection unit of saidinvention injects the cleaning liquid from the upper side of flowingdirection of the exhaust air to the filters. Next, cleaning is carriedout by injecting the cleaning liquid from the upper side of flowingdirection of the exhaust air to the filters in the injection unit.Therefore, cleaning carried out by injecting the cleaning liquid fromthe upper side of flowing direction of the exhaust air to the filters inthe injection unit allows to clean efficiently the filters easilypreventing injecting the cleaning liquid to the outside, easily collectan injected cleaning liquid and the cleaning liquid contaminated bypollutants to make the structure simple. Further, in the invention, thecleaning liquid of said invention is incombustible, and vegetable.Incombustible, and vegetable cleaning liquid is used. Thus, the use ofincombustible, and vegetable cleaning liquid allows to handle it easily,treat easily the cleaning liquid contaminated by pollutants removed fromthe exhaust air, and use it in an atmosphere receiving a heat load. Inaddition, in the invention, the cleaning liquid of said inventioncontains amine soap as the main component made from tallol as thematerial and a higher alcoholic nonionic surfactant. The cleaning liquidof said invention containing amine soap as the main component made fromtallol as the material and a higher alcoholic nonionic surfactant isused. Thus, the use of the cleaning liquid of said invention containingamine soap as the main component made from tallol as the material and ahigher alcoholic nonionic surfactant allows to yield easy treatment,incombustibility, easy handling, and the higher cleaning performance andclean the exhaust air well efficiently and stably for a long time.

Furthermore, an exhaust cleaning system of the present invention is anexhaust cleaning system according to the above invention, wherein thefilter has an incombustibility or a noncombustibility and a corrosionresistance.

And the filter is formed incombustible or noncombustible.

Therefore, since the filter is formed incombustible or noncombustibleand corrosion resistant, the filter is not deteriorated by cleaningusing the cleaning liquid and can be used even under an atmosphere inwhich it is subject to a heat load and the cleaning efficiency of theexhaust air is stable in a long period.

On the other hand, an exhaust cleaning system of the present inventionis an exhaust cleaning system according to the above invention, whereinthe filter is formed with at least either of gathered slender metal.wires or gathered slender thin metal sheets.

And at least either of gathered slender metal wires or gathered slendermetal thin sheet form the filter.

Therefore, since at least either of gathered slender metal wires orgathered slender metal thin sheets form the filter, softness,noncombustibility, corrosion resistance and a high strength can easilybe obtained, production is made easy and productivity is improved, and alow price is possible and the cleaning efficiency of the exhaust air isstable in a long period.

An exhaust cleaning system of the present invention is an exhaustcleaning system according to the above invention, wherein the filter isformed with stainless steel.

And the filter is formed with stainless steel.

Therefore, since the filter is formed with stainless steel,noncombustibility, a high corrosion resistance and a high strength caneasily be obtained and the cleaning efficiency of the exhaust air isstable in a long period.

Furthermore, an exhaust cleaning system of the present is an exhaustcleaning system according to the above invention, wherein the main bodyhas a leg part that mounts the main body to move on a floor surface.

And the main body has a leg part that mounts the main body to move on afloor surface.

Therefore, since the main body is provided with the leg part that mountsthe main body to move on a floor surface, an exhaust air can be cleanedefficiently by moving the main body while coping with a condition theexhaust air is generated.

An exhaust cleaning system of the present invention is an exhaustcleaning system according to the above invention, wherein the cleaningmeans is provided with a cleaning liquid supply/discharge means forsupplying and discharging a cleaning liquid.

And the cleaning means is provided with a cleaning liquidsupply/discharge means for supplying and discharging a cleaning liquid.

Therefore, since the cleaning means is provided with a cleaning liquidsupply/discharge means for supplying and discharging a cleaning liquid,a supply to the cleaning means and a discharge of the cleaning liquid isperformed efficiently by the cleaning liquid supply/discharge means,without soiling other parts.

Further, an exhaust cleaning system of the present invention is anexhaust cleaning system according to the above invention, wherein thefilter is covered with a flow restricting body having flow holes that donot allow a linear flow of an exhaust air.

And the filter is covered with the flow restricting body having flowholes that do not allow the linear flow of the exhaust air.

Therefore, and since the filter is covered with the flow restrictingbody having flow holes that do not allow the linear flow of the exhaustair and the exhaust air is cleaned while flowing through the filterafter flowing through the flow holes of the flow restricting body andbeing removed of contaminant in the exhaust air, a contaminant removalload of the filter is decreased, a contaminant removal rate in theexhaust air is improved, a cleaning performance is improved, and theexhaust air is efficiently cleaned and the cleaning efficiency of theexhaust air is stable in a long period.

An exhaust cleaning system of the present invention is an exhaustcleaning system according to the above invention, wherein the cleaningmeans has a receiving tank with a plain area equal to or exceeding thatof the filer and arranged underneath said filter.

And the receiving tank with a plain area equal to or exceeding that ofthe filter is arranged underneath the filter.

Therefore, since the receiving tank with a plain area equal to orexceeding that of the filter is arranged underneath the filter, filtercleaning and a collection of a cleaning liquid after cleaning are simplein composition and are easy without soiling other parts.

Further, an exhaust cleaning system of the present invention is anexhaust cleaning system as claimed in the above invention, wherein themain body is equipped with a fire detection means for detecting fire anda shutter body for closing the exhaust outlet.

And the main body is equipped with a fire detection means for detectingfire and a shutter body for closing the exhaust outlet.

Therefore, since the main body is equipped with a fire detection meansfor detecting fire and a shutter body for closing the exhaust outlet, afire, if any, is prevented from invading into the system by closing theexhaust outlet by the shutter body, and thereby damage by a flame caneasily be prevented. Furthremore, and since the shutter body is providedat the exhaust outlet where the exhaust air that is mostly removed ofcontaminants flows, the shutter body is not soiled with contaminants andcan normally operate, and maintenance can easily be made.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a front sectional view showing an embodiment of an exhaustcleaning system of the present invention.

FIG. 2 is a partially cutaway perspective view of the above.

FIG. 3 is a perspective view showing a filter part of the above.

FIG. 4 is a perspective view of a filter part showing another embodimentof an exhaust cleaning system of the present invention.

FIG. 5 is a front sectional view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 6 is a partially cutaway perspective view of the above.

FIG. 7 is a front sectional view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 8 is a front sectional view showing a periphery of a main body caseshowing still another embodiment of an exhaust cleaning system of thepresent invention.

FIG. 9 is a perspective view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 10 is a partially cutaway perspective view showing the exhaustcleaning system of the above.

FIG. 11 is a perspective view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 12 is a front sectional view of the above.

FIG. 13 is a partially cutaway perspective view showing the exhaustcleaning system of the above.

FIG. 14 is a front sectional view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 15 is a partially cutaway perspective view of the above.

FIG. 16 is a front sectional view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 17 is a front sectional view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 18 is a partially cutaway perspective view of the above.

FIG. 19 is a front sectional view showing still another embodiment of anexhaust cleaning system of the present invention.

FIG. 20 is a perspective view showing a conventional exhaust cleaningsystem.

FIG. 21 is a front sectional view of the above.

FIG. 22 is a sectional view showing a louver structure of a greasefilter of the above.

FIG. 23 is a sectional view showing a louver structure of a greasefilter of another conventional exhaust cleaning system.

FIG. 24 is a sectional view showing a louver structure of a greasefilter of still another conventional exhaust cleaning system.

FIG. 25 is a sectional view showing a louver structure of a greasefilter of still another conventional exhaust cleaning system.

BEST MODE FOR CARRYING OUT THE INVENTION

Next, an embodiment of the exhaust system according to the invention isexplained hereunder, referring to the drawings.

n FIG. 1 and FIG. 2, a numeral 1 is a kitchen system, and the kitchensystem 1 has a combustion system 4 having a fire source 3, such as a gasrange on which a cooking device 2 can be mounted, and an exhaust system6 for sucking an exhaust air 5 generated curing cooking and dischargingthe same outdoors.

Also, the exhaust system 6 has a hood 8 attached to a ceiling, not shownin the drawing, of a kitchen 7. The hood 8 is nearly a box shape with aninlet opening 9 that is opened in an lower face and forms a dischargeopening 10 that is opened in a near center of an upper face. Further, atthe discharge opening 10 of the hood 8, a fire damper 11 is provided asa shutter body to vary an open condition of the discharge opening 10,namely to close the discharge opening 10 in case of a fire.Additionally, the fire damper 11 may be operated manually to open/closethe discharge opening 10 or actuated by a detection of a sensor fordetecting smoke, a flame, heat and the like, not shown in the drawing.

Further, at a periphery of the inlet opening 9 of the hood 8, forexample at a front and both sides, an internally bent concave trough 12is provided. Also, at an upper part of the hood 8, an exhaust duct 14 isconnected, of which one end is connected so as to cove the dischargeopening 10 and the other end has a fan, a blower and the like that runoutdoors and are not shown in the drawing. Further, in the hood 8, amain body of exhaust cleaning system 15 is arranged.

Here, the main body of exhaust cleaning system 15 has a pair of endplates 16, 16 that are formed nearly as an equal-leg trapezoidal platewith a heat resistant and corrosion resistant noncombustible material,such as a stainless steel plate, and a main body case 18 that is formedin a box shape having openings in upper and lower faces and expandingupward with a pair of side plates 17, 17 that are formed in a nearlyrectangular plate with stainless steel plates and are provided at sidesedges of these end plates 16, 16. Additionally, one of the end plates 16is provided with a nearly circular inspection hole, which can be freelyopened/closed by a cover (not shown in the drawing) and through which aninside of the main body case 18 can be checked, is provided, the pair ofside plates 17, 17 are formed in a frame shape that respectively openinlets 19, 19, and an air that flows from these inlets 19, 19 into themain body case 18 is discharged from an exhaust outlet 20, an opening ofthe upper face of the main body case 18. Further, the side plate 17 isarranged so that a plain is approximately 45 degrees tilted with regardto a horizontal direction.

At a lower part of the main body case 18, a box-shaped cleaning liquidtank 22 that opens its upper face so as to cover the opening at a lowerface is provided as a receiving tank. On each inner face side of theside plates 17, 17 of the main body case 18, louver type grease filters23, 23, as flow restricting bodies, are attached to be freelymounted/dismounted so as to close the inlets 19, 19. Additionally, thegrease filter 23, like a conventional grease filter, is a louverstructure having multiple flow holes (not shown in the drawing) throughwhich the exhaust air 5 flows, is attached to the side plate 17 that istilted approximately 45 degrees, and is formed so that depositingcontaminants, including oil/grease and tarry matters, do not drop.Meantime, to prevent contaminants from dropping, a collection member mayotherwise be provided.

Further, underneath the main body case 18, a flat-saucer-shapedcollection part 24 is provided for collecting a liquid that drops fromthe main body of exhaust cleaning system 15.

At the main body case 18, rotary shafts 25a, 25b, having an axialdirection along a direction opposite from the pair of end plates 16 andboth ends of which are held to freely rotate by bearings that are notshown in the drawing and are respectively provided at the end plates 16,16, are arranged with a plural number, three pieces, for example. Theserotary shafts 25a, 25b are arranged so as to come to vertexes of anearly reverse triangle along the end plates 16, 16 in shape and therotary shaft 25b positioned below is positioned in the cleaning liquidtank 22. Also, one of the rotary shafts 25a is projected at one end fromthe end plate 16, and an output shaft 27 of a motor 26, as a drivingmeans arranged on the outer face side of the end plate 16 of the mainbody case 18, is connected to the projected end. Additionally, the motor26 is supplied with and driven by a commercial AC power source that isproperly phase-controlled by a control means, not shown in the drawing,by way of a power cable 28, and thereby a moving means 29 is formed.

Also, at both ends of the rotary shafts 25a, 25b, gears 30, 30 areprovided, and the gears 30, 30 are spanned with endless chains 31, 31 sothat the rotary shafts 25a, 25b rotate in the same direction driven bythe motor 26. To the chains positioned at both ends of the rotary shafts25a, 25b, both side edges of an endless-belt-shaped filter 33 areattached so as to connect them.

The filter 33 is, shown in FIG. 3, formed with an endless net 34 formedin a mesh shape with stainless steel wires, for example, and both endsof which are respectively attached to the chains 31, 31, and a mat part35 gathered into a mat form with stainless steel wires, for example, andmonolithically provided to an outer face of the net. Additionally, forthe stainless steel wires composing the filter 33, for example, a 100 umthin-wire-shaped stainless steel wires or a slender-ribbon-shapedstainless steel sheet are used, and the mat part 35 is gathered into afibrous microfiber and formed in a permeable mat shape. Further, thefilter 33 of its both ends is attached to the chains 31, 31 that arespanned to the rotary shafts 25a, 25b, which are arranged to come tovertexes of a nearly reverse triangle, and is formed in a nearlytriangular tube shape having a space 36 formed inside so that a lowerend corner is positioned in the cleaning liquid tank 22.

Additionally, the filter 33 is, at its upper face of a part spannedbetween the rotary shafts 25a, 25a, located nearly at the same positionwith an upper edge of the main body case 18, and the upper face partclosely covers the discharge opening 10. Also, the filter nearly touchesand adheres to each inside face of the grease filters 23, 23 at itsouter face of a part spanned between the upper rotary shafts 25a, 25aand the lower rotary shaft 25b.

Further, a plain area of the filter 33 covering an upper part of theexhaust outlet 20 is nearly the same as an area of an upper opening ofthe cleaning liquid tank 22, namely view in a plan, the cleaning liquidtank 22 is the same as or slightly larger than the filter 33 so that acleaning liquid if dropped from the filter 33 can be collected by thecleaning liquid tank 22.

Additionally, since the grease filter 23 is a louver structure,oil/grease and tarry matters adhering to the grease filter 23 and acleaning liquid and the like dropped from the filter 33 are lead to andcollected by the cleaning liquid tank 22. Also, the grease filter 23 isnot required to have such a high removal rate as is conventionallyrequired for contaminants. That is, since contaminants are removed bythe filter 33, removal may be just supplementary or almost zero, and aconstruction that simply makes the filter 33 invisible from an outsidefor protection and functions as a cover to prevent an externally movingcooking device from being caught by the filter 33, is enough.

And the main body of exhaust cleaning system 15 is closely attached sothat an upper end of the main body case 18 covers the discharge opening10 at an upper bottom face of the hood 8 and connect the exhaust outlet20 of an upper face of the main body case 18 to the discharge opening 10under an airtight condition so as the filter with its upper face toclose the discharge opening 10, namely to cover the same without anyclearance. Additionally, the main body of exhaust cleaning system 15 isformed of its exhaust air path so that the exhaust air 5 that flows fromthe inlet opening 9 of the hood 8, namely the exhaust air 5 containingan oil/grease evaporated from cooking oils during cooking and tarrymatters formed with an oil/grease by adhering to aerial dust is passedthrough the inlets 19, 19 of the main body of exhaust cleaning system,the grease filters 23, 23, side faces of the filter 33 adhering to thegrease filter 23, the space 36 in the filter 33, the discharge opening10 where the fire damper 11 is provided by way of the upper face of thefilter 33 covering the discharge opening 10, and the exhaust duct 14,and is discharged outdoors.

An upper part of one end of the cleaning liquid tank 22 is connected toa tank 41 for storing a cleaning liquid 40 that is attached to a frontface of an outer surface of the hood 8 by way of a supply tube 43 havinga supply valve 42, and the cleaning liquid 40 is supplied from the tank41 by way of the supply tube 43 and stored in the cleaning liquid tank22. Additionally, the cleaning liquid 40 is, for example, mainlycomposed of an amine soap made of tolu oil conditioned with an oleicacid and a linolic acid extracted from plants, such as pine, and theamine soap is mixed with a higher-alcoholic anionic surfactant.Incidentally as a cleaning liquid used for this purpose, one that has ahigh cleaning performance particularly with respect to oil/grease, hasan antimicrobial activity, is neutral, does not contain antiseptics andphosphorus, and is colorless and noncombustible, is desirable.

Further, to a bottom part of another end of the cleaning liquid tank 22,a discharge tube 46 having a discharge valve 45 for discharging thecleaning liquid 40 stored in the cleaning liquid tank 22 is connected.Also, to an upper part of the other end, one end of an overflow tube 47for regulating the cleaning liquid 40 stored in the cleaning liquid tank22 at a constant volume is connected, and if the cleaning liquid 40 issupplied to the cleaning liquid tank 22 exceeding the prescribed volume,an excess volume is overflown and discharged from the overflow tube 47through the discharge tube 46. Additionally, a volume of the cleaningliquid 40 is set such that the filter 33 at its lower end positioned inthe cleaning liquid tank 22 is immersed in the cleaning liquid 40. Thus,a cleaning liquid supply/discharge means 48 is formed with the cleaningliquid 40, the tank 41, the supply tube 43 having the supply valve 42,the discharge tube 46 having the discharge valve 45, and the overflowtube 47.

In the cleaning liquid tank 22, a trembler 50 generating fine vibrationsis arranged, and an ultrasonic cleaning means 53 that is connected to anultrasonic transmitter 51, arranged at a front on an outer face side ofthe hood, with a lead wire 52 is formed with the trembler 50. Theultrasonic cleaning means 53 is composed such that the trembler 50vibrates by an operation of the ultrasonic transmitter 51, the cleaningliquid 40 stored in the cleaning liquid tank 22 ultrasonically vibratesto ultrasonically clean the filter 33 a part of which is immersed in thecleaning liquid 40 in the cleaning liquid tank 22.

Thus, a cleaning means 55 is formed with the ultrasonic cleaning means53, the cleaning liquid supply means 48 and the cleaning liquid tank 22.

Further, in the cleaning liquid tank 22, a gauge, not shown in thedrawing, is provided to facilitate an external visual check of thecleaning liquid 40.

Next, an operation of above first embodiment is described.

First, the tank 41 and the ultrasonic transmitter 51 attached to thehood 8 are respectively connected to the main body of exhaust cleaningsystem 15 which is previously assembled inside the hood 8, and therebythe exhaust system 6 is formed. After the cleaning liquid 40 is filledin the tank 41, making sure that the discharge valve 45 is closed, aprescribed volume of the cleaning liquid 40 is supplied to the cleaningliquid tank 22 of the main body of exhaust cleaning system 15 by openingthe supply valve 42, while observing a gauge not shown in the drawing.Additionally, when the cleaning liquid 40 is flown exceeding theprescribed volume, an excess volume is overflown and discharged from thedischarge tube 46 through the overflow tube 47.

Thereafter, suction is performed by operating a fan and a blower, notshown in the drawing, of the exhaust duct 14. Further, the filter 33 iscirculatingly and rotationally moved by operating the motor 26 and acooking preparation is done by operating the ultrasonic cleaning means53.

Next, a cleaning operation of the exhaust air 5 by above-mentionedembodiment is described.

By cooking, a vapor of oil/grease is generated and an air containing thevapor, namely the exhaust air 5 is absorbed from the inlet opening 10 ofthe hood 8 by an operation of the fan and the blower. Further, theexhaust air absorbed into the hood 8 is absorbed from the inlets 19, 19of the main body of exhaust cleaning system 15 and is flown nonlinearlythrough flow holes, not shown in the drawing, of the grease filters 23,23. While flowing through the grease filter 23, a part of dust,oil/grease and tarry matters in air deposit and are separated andremoved from the exhaust air 5.

Also, the exhaust air after passing through the grease filter 23 passesthrough a side face part of the filter 33 that is closely adjacent tothe grease filter 23 and flows into the space 36 in the filter 33.Additionally, in flowing through the filter 33 which is formed withgathered fine stainless steel wires, the exhaust air 5 flows nonlinearlythrough a narrow clearance of stainless steel wires inside the filter33. Further, since the filter 33 is formed with gathered fine stainlesssteel wires, its specific surface area is large compared to the greasefilter 23, a flow path through which the exhaust air 5 flows is verynarrow, and what is more, like the grease filter 23, contraction isfrequently repeated, and thereby contaminants in the exhaust air 5,including fine dust, oil/grease and tarry matters, are mostly caught bythe filter 23 and are separated and removed.

Further, the exhaust air 5 absorbed by the space 36 flows through anupper part of the filter 33. By flowing through the filter 33 again, bya similar action contaminants in the exhaust air 5 are almost completelyseparated and removed and the exhaust air 5 is cleaned. By way of thedischarge opening 10 of the fire damper 11, the exhaust air 5 isabsorbed by the exhaust duct 14 and is discharged outdoors.

Also, by a rotational movement effected by the motor 26, the filter 33of its part where contaminants separated and removed from the exhaustair 5 deposit is immersed in the cleaning liquid tank 22 in which thecleaning liquid 40 is stored and the ultrasonic cleaning means 53operates, and by a synergy cleaning effect of the cleaning liquid 40 andultrasonic waves, contaminants are almost completely removed from thefilter 33, so that a new part cleaned in the cleaning liquid tank 22 isopposed to the inlet 19 by moving rotationally by operating motor.

Additionally, when the cleaning liquid 40 is contaminated by a used fora prescribed time, by opening the discharge valve 45, the contaminatedcleaning liquid 40 stored inside is discharged by way of the dischargetube 46. Thereafter, closing the discharge valve 45 again, the supplyvalve 41 is opened and the cleaning liquid 40 is supplied to thecleaning liquid tank 22 of the main body of exhaust cleaning system 15up to the prescribed volume, while observing the gauge. Additionally,desirably the cleaning liquid 40 is collected separately by an effluentvessel and is treated separately so as to allay a burden of sewagetreatment.

If a shortage of the cleaning liquid 40 is observed via the gauge due toevaporation and the like, though the cleaning liquid 40 is not so muchcontaminated and there is no need to replace the cleaning liquid 40,opening the supply valve 42, the cleaning liquid 40 is supplied to thecleaning liquid tank 22 of the main body of exhaust cleaning system,while observing the gauge.

According to the above first mentioned, since the exhaust air 5 flowingfrom the inlets 19, 19 of the main body of exhaust cleaning system 15 isflown through and cleaned by the permeable filter 33, where contaminantsin the exhaust air 5 are caught, separated and removed by the filter 33,and is discharged from the discharge opening 10 connected to the exhaustoutlet 20, while the filter 33 on which the contaminants separated andremoved from the exhaust air 5 deposit is cleaned by contact with thecleaning liquid 40, namely by immersion in the cleaning liquid 40;cleaning operations such as to remove and clean components and cleaninside the exhaust duct 14 after using the kitchen system 1, a nearlyautomatic cleaning is possible, the exhaust air 5 is cleaned efficientlyand easily, and an easy maintenance is possible.

Also, since the filter 33 is moved and immersed and cleaned in thecleaning liquid tank 22 in which the cleaning liquid 40 is stored, acontamination of other parts by splashes of the cleaning liquid 40 canbe prevented, there is no loss in cleaning liquid 40 by a splashedcleaning liquid being discharged together with the exhaust air 5 by wayof the duct 14, and thus the cleaning liquid 40 is used effectively forcleaning.

Further, since the filter 33 is moved with the discharge opening 10,connected to the exhaust outlet 20 through which the exhaust air 5 isdischarged, closed, the filter 33 can be cleaned while simultaneouslyseparating and removing contaminants in the exhaust air 5, and byautomation, there is no need to break off cooking and stop the main bodyof exhaust cleaning system 15 to clean the filter.

Still further, unlike cleaning the exhaust air 5 using a conventionallyfixed filter in which the exhaust air 5 is cleaned by the same face andcontaminants are caught by a part of the filter, resulting in adegradation in cleaning efficiency and a fear of an air soundaccompanying a biased flow of the exhaust air 5. On the other hand inthe above first embodiment, by moving the filter 33, contaminants arecaught equally by an entire face of the filter 33, and the exhaust air 5can be cleaned efficiently.

Also, as the filter 33 formed as an endless belt is spanned and isrotationally moved by forming a nearly reverse triangle having the space36 inside, the exhaust air 5 can be flown twice through the filter 33with a simple construction, contaminants in the exhaust air 5 can beremoved almost completely, the fire damper 11, the exhaust duct 14, thefan and the blower cleaning of which is difficult are not contaminated,the fire damper 11, the fan and the blower can operate normally, an easymaintenance is possible, and the filter 33 can be thinned. Further,since the filter 33 can freely be changed in shape, assembly operations,including spanning, are made easy, and it is also possible to freelychange the filter 33 in shape so as to cope with an installation spaceto mount the main body of exhaust cleaning system 15, and therebyworkability and productivity can be improved. Also, since the filter 33formed in a tubular shape is rotationally moved, no other space isnecessary for movement, and thus a compact design is easily applicable.

Further, since the filter 33 is formed by gathering slender stainlesssteel wires or thin stainless steel sheets, the filter 33 can be formedflexible, noncombustible, highly corrosion resistant and highly strong,it can be used under an atmosphere where a heat load is applied, such asthe kitchen system 1, does not generate corrosion and rust and canstably clean the exhaust air 5 for a long period and maintenance is madeeasy, and since a conventional gathering process of metal wires, as is,can be used for production, production is easily possible at a low cost,and productivity can be improved.

Also, since the filter 33 is attached to the chains 31, 31 spanned torotary shafts 25a, 25b and is rotationally moved by the motor 26, amovement load is not applied directly to the filter 33 and a damage inthe filter 33 can be prevented, and the tubular shape of the filter 33can be axially maintained, without causing sagging, by the rotary shafts25a, 25b, thereby preventing a biased cleaning of the exhaust air 5 thatotherwise may be caused due to sagging and the interference with otherparts.

On the other hand, since the filter 33 is cleaned by the synergy effectof chemical cleaning by the cleaning liquid 40 and physical cleaning bythe ultrasonic cleaning means 53, contaminants caught by filter 33 canbe removed almost completely, a clogging in the filter 33 can beprevented, and the exhaust air 5 can be cleaned effectively for a longperiod.

Also, since a transmission of an ultrasonic wave of the ultrasoniccleaning means 53 is adjusted and controlled by the ultrasonictransmitter 51 provided outside the hood 8, operation can be doneeasily.

Further, since the cleaning liquid tank 22 is formed so the area of theupper opening is nearly the same as the plain area of the filter 33 andis arranged underneath the filter 33, an immersion cleaning of thefilter 33 in the cleaning liquid 40 can be designed with a simpleformation, and even if the cleaning liquid 40 drops from the filter 33when the filter 33 is moved upward from the cleaning liquid 40,collection is possible without allowing dropping onto the combustionsystem 4 and the like, so a contamination of other parts can beprevented.

Also, since the cleaning liquid 40 stored in the cleaning liquid tank 22into which the filter 33 is immersed is supplied and disposed by thecleaning liquid supply/discharge means 48, operations such as to pourthe cleaning liquid 40 into the cleaning liquid tank 22 is not necessaryand so other parts are not contaminated due to overflowing and splashingduring pouring, and when the cleaning liquid 40 is properly stored inthe tank 41 that is externally provided and to which supply is madeeasily, the cleaning liquid 40 can easily be supplied/discharged byopening/closing the supply valve 42 and the discharge valve 45.

Further, since the gauge is provided at the cleaning liquid tank 22, asupply/discharge of the cleaning liquid 40 can easily be done, and it iseasily possible to confirm that the cleaning liquid 40 is stored up tothe prescribed volume.

Also, the cleaning liquid 40 is mainly composed of an amine soap, anoncombustible, vegetable neutral detergent made of tolu oil andcontains a higher-alcoholic anionic surfactant, a high cleaning powercan be obtained, and being vegetable that can be decomposed by microbes,the cleaning liquid 40 after cleaning can easily be treated, is notstimulating a skin, can easily be handled, and is available for anatmosphere where a heat load is applied, such as the kitchen system 1.Further, since the cleaning liquid 40 is a neutral vegetable detergent,a deodoring effect can be attained by odor contents in the exhaust air 5adhering to the cleaning liquid 40 that deposits on the filter 33.

On the other hand, since the grease filter 23 having flow holes thatdoes not allow a linear flow of the exhaust air 5 is arranged closelyadjacent on the upper reach of the filter 33 along the flow direction ofthe exhaust air 5 so as to cover the filter 33 and contaminants can beseparated and removed to a certain degree before removing contaminantsby the filter 33, a contaminant removal load of the filter is decreased,a cleaning load of the filter 33 is decreased, and a contaminant removalrate is improved and the exhaust air 5 is efficiently cleaned for a longperiod. Further, since the filter 33 is covered by the louver typegrease filter 23, the filter 33 is externally invisible and anappearance is improved.

Further, since the grease filter 23 is formed as a louver structure thatdoes not allow contaminants adhering to the grease filter 23 to dropwhen the grease filter 23 is attached having an inclination, other partsare not soiled.

Still further, since the grease filter 23 is arranged having a 45-degreeinclination, it is possible to flow the exhaust air 5 into the main bodyof exhaust cleaning system 15 so as to form a smoothly flowing air pathwith a small space, the exhaust air 5 can efficiently be absorbed andcleaned, thereby improving a cleaning efficiency of the exhaust air 5.

Also, since the fire damper 11 is attached at the exhaust outlet 20, afire occurring during cooking, if any, can easily be prevented frominvading into the main body of exhaust cleaning system 15 by closing theexhaust outlet 20, and being arranged at the exhaust outlet 20 throughwhich the cleaned exhaust air 5 passes, the fire damper 11 is protectedagainst an adhesion of contaminants and can normally operate, andmaintenance can easily be made.

Further, since the inspection hole is provided in the main body case 18,maintenance can easily be made.

Also, since the collection part 24 is arranged underneath the cleaningliquid tank 22, a drop of contaminants adhering to an outer periphery ofthe cleaning liquid tank 22 can be prevented. Namely, since the cleaningliquid tank 22 of its outer face is cooled because the cleaning liquid40 is stored, there is a fear that contaminants in the exhaust air 5forms dews on the outer face of the cleaning liquid tank 22 and thesecontaminants drop, but since the collection part 24 is a flat saucershape that is heated during cooking and is hard to generate dews anddews if generated are soon evaporated, there is scarcely a fear of dropfrom a bottom face of the collection part 24.

Additionally, in above first embodiment, a composition in which thefilter 33 is formed as an endless belt and is attached to androtationally moved by the chains 31, 31 is described, but a compositionsuch that slender-plate-shaped bridge members, for example, made ofstainless steel plates are provided with prescribed intervals so as eachto be connected with the chains 31, 31 that are positioned at both endsof the rotary shafts 25a, 25b, and the endless-belt-shaped filter 33 isset to the bridge members so that the filter 33 is rotationally movedalong with a rotational movement of the chains 31, 31 accompanying arotation of the rotary shafts 25a, 25b is also possible. According tothis composition, a sag in the filter 33 positioned between the rotaryshafts 25a, 25b can be prevented, and further a biased cleaning of theexhaust air 5 and a hindrance to movement, such interference with otherparts, can be prevented, and the filter 33 can be rotated and movedsmoothly.

Further as shown in FIG. 4, a composition such that holding members 62each as a filter holding part, formed in a frame shape having a window61, having hinges engaged to mutually move on both sides in a lengthdirection, and holding a mat-shaped filter 63 and the grease filter 23so as to close the window 61 are connected in an endless chain form andcomposed as an endless belt, and both ends of these holding members 62are connected to chains 31, 31 with metal fittings 62a and the like toform a nearly tubular shape for a rotationally movement. According tothe composition shown in FIG. 4, a movement load is not directly appliedto the filter 63, a damage of the filter 63 can be prevented, the filter63 can be moved without causing a sag, the filter 63 can easily bemounted/dismounted only by mounting to/dismounting from the filter 63from the window 61, the filter 63 can be formed as a simple rectangularshape, and productivity and maintenance, including a replacement of thefilter 63, can be improved.

Additionally, though the filter 33 is spanned to the rotary shafts 25a,25b and is formed in a nearly reverse triangular tubular shape in thedescription, a composition in which the filter 33 is formed in a tubularshape shown in FIGS. 5 and 6, or as shown in FIG. 7, the filter 33 is anendless belt shape is spanned with multiple foldings, or as shown inFIG. 8, the filter 33 is formed in a flat tubular belt conveyer shape,is also applicable, and thus the filter 33 may be spanned and formed ina tubular shape or a monolithic tubular shape.

Further, when a composition in which, by forming a tubular shape shownin FIGS. 5 and 6, namely by forming a monolithic tubular filter body 67in which a mat-shaped filter 65 is held by a filter holding part 66formed in a drum frame shape, the filter body 67 is rotated around thefilter holding part 66 as a rotation axis to clean the exhaust air 5 isemployed. In case where the filter body is formed in a drum-shaped,since the filter body 67 is a drum-shaped attachment structure, thefilter 65 can easily be replaced by replacing the filter body 67, andlike a composition shown in FIG. 4, the filter 65 is free of a directmovement load and a consequent damage and can be moved without causing asag.

Still further, in the case of a composition shown in FIG. 7 in which thebelt-shaped filter 33 is spanned in a tubular shape by folding the samemultiple times, since the exhaust air 5 can be flown through the filter33 multiple times, even the exhaust air 5 under an extremely soiledcondition can be cleaned almost completely.

Also, in the case of a polygonal or a flat tubular formation shown inFIG. 8, since a composition in which a corner and a flat side isimmersed in the cleaning liquid 40 in the cleaning liquid tank 22 ispossible, a compact design is easily applicable. Additionally, in thecomposition shown in FIG. 8, the filter 33 is arranged symmetrically,but one side only is also possible, and in this case, since the flatfilter 33 can be arranged in a small space, a further compactapplication is possible.

In a composition shown in FIG. 8, filter 33 is arranged but that isshown in FIGS. 9 to 10.

That is, as shown in FIGS. 9 and 10, a compact design by a compositionin which the endless-belt-shaped filter 33 is spanned in a flat tubularshape so that a plain is opposed to a fan 70 and an upper part is tiltedin a direction receding from the fan and a grease filter 71, as a flowrestricting body, having punched flow holes 19 on a face side notopposing to the fan 70 that comes to an lower face side of the filter 33is arranged in the hood 8 to be freely mounted/dismounted, can be usedat households, too. Additionally, the filter 33 can be spanned nearlyvertically instead of tilted spanning.

On the other hand, as the cleaning liquid 40, in addition to one mainlycomposed of amine soap, any one that has a high cleaning performance anddoes not corrode filters 33, 63 and 65 and the cleaning liquid tank 22is acceptable, and desirably one that can easily be treated and handled,and one that is noncombustible particularly for use at a place where aheat load is applied, such as a kitchen.

Also, in addition to gathered stainless steel wires, the filters 33, 63and 65 can be made of a material that has a permeability for the exhaustair 5 to flow through, can remove contaminants in the exhaust air 5 andis not damaged by contact with the cleaning liquid 40, but for used at aplace such as a kitchen where are heat load is applied, a material thatdo not easily cause corrosion and rust and is noncombustible, such as analuminum alloy wire, is desirable. In addition, if the exhaust air 5contains a hazardous gas, the filters 33, 36 and 65 may carry activatedcarbon particles, or a permeable activated carbon sheet (developed bythe British Department of Defense and produced by SGS YarsleyInternational Certification Services Ltd.; trade name ACC) may be usedas a filter or the activated carbon sheets may be superposed with thefilters 33, 63 and 65 so as they are positioned on the space 36 side, ora fibrous activated carbon may be gathered and used as a filter. Usingthese activated carbon products, such a hazardous gas is adsorbed andremoved, and odor is removed, too.

Further, on a top end side of the discharge tube 40, a clarifier forclarifying the contaminated cleaning liquid 40 may be provided and acirculation system for returning the clarified cleaning liquid 40 to thecleaning liquid tank 22 may also be provided. According to thesecompositions, in addition to that the cleaning liquid 40 can be usedefficiently, a sewage treatment load due to discharging the contaminatedcleaning liquid 40 as is into sewage can be decreased.

Also, a composition such that a means for detecting a volume of thecleaning liquid 40 is provided in the cleaning liquid tank 22, and bydetecting that the cleaning liquid 40 is in short, the cleaning liquid40 is supplied from the tank 41, such as a float valve, may also beprovided. According to this composition, it is possible to prevent asituation that the cleaning liquid 40 is scarce and the filters 33, 63and 65 cannot be cleaned, and thus a sure and efficient cleaning of theexhaust air 5 can be performed for a long period.

Further, a composition in which a roller or a air injection means may beprovided on a side where the filters 33, 63 and 65 move from thecleaning liquid 40 and thereby the filters 33, 63 and 65 are pressed andremoved of the cleaning liquid 40 may also be provided. According tothis composition, a drop of the cleaning liquid 40 from the filters 33,63 and 65 can be prevented, without soiling other parts, and byproviding the roller and the like, an air path for flowing the exhaustair 5 to the filters 33, 63 and 65 can be formed simultaneously by asimple composition, the exhaust air 5 can be thoroughly cleaned, and acleaning efficiency can be improved by a simple composition. Further, byproviding the roller, there is a fear that a noise is generated when thefilters 33, 63 and 65 are rotated and rotationally moved while keepingclose contact with the grease filter 23, but since the roller rotatesalong with the rotation and rotational movement of the filters 33, 63and 65, no noise is generated, a friction due to the close contact canreduce a load of rotational movement and thus the filters 33, 63 and 65can be moved smoothly. When the filter 33, 63 and 65 are not rotated, nonoise is generated.

Also, though the filter 33 is stuck to the exhaust outlet 20 and thegrease filter 23, for example, like an embodiment shown in FIGS. 5 and6, by employing a composition in which a movable plate 78, that isenergized by the coil spring 77 and the like and of which one end is afree end, is provided at a top 76 having the exhaust outlet 20 of themain body case 75 as a main body in a center part, the movable plate 78may be stuck to an outer face side of the filter 65. According to thiscomposition, even when the filters 33, 63 and 65 are not stuck to theexhaust outlet 20 and the grease filter 23, the exhaust air 5 can surelyflow through the filters 33, 63 and 65 by a simple formation, and theexhaust air 5 can thoroughly be cleaned and a cleaning efficiency caneasily be improved by a simple composition. In particular, as shown inthe embodiment of FIGS. 5 and 6, application is possible with a simpleformation to a construction having a curved outer face for forming anair path through which the exhaust air 5 can smoothly flow. Further, apressing effect of the filters 33, 63 and 65 can be obtained.

On the other hand, though the description is given by arranging thegrease filter 23, for example, as shown in FIGS. 9 and 10, a grid body,either formed with mesh or punched, may be attached to the inlet 19 ofthe side plate 17 of the main body case 18 to be freelymounted/dismounted, or by directly punching the side plate 17, thepunched holes may be used as the inlet 19. These compositions canprovide a compact, lightweight main body of exhaust cleaning system 15for use at an environment where oil/grease is not generated so much.

Also, though the description is given such that the exhaust air 5 iscleaned by operating the ultrasonic cleaning means 53, it is alsopossible to start cleaning the filters 33, 63 and 65 by a cleaningability of the cleaning liquid 40, and ultrasonic cleaning may beapplied when a cleaning power starts degrading. According to thiscomposition, a running cost can be reduced. Further, when acontamination of the exhaust air 5 is low or contaminants can easily beremoved by the cleaning liquid 40, a simple, inexpensive constructionwithout the ultrasonic cleaning means 53 may be provided separately toimprove productivity and provide a compact system.

On the other hand, though the filter 33, 63 and 65 are rotated androtationally moved to immerse a part into the cleaning liquid forcleaning while cleaning the exhaust air 5, when a time of continuousrunning is short and the exhaust air 5 is cleaned by an intermittentrunning, for example, the filter 33, 63 and 65 are not moved duringcleaning the exhaust air 5 but a composition in which the filters 33, 63and 65 are moved in parallel, or by moving the cleaning liquid tank 22,the filters 33, 63 and 65 are totally immersed in the cleaning liquid 40for cleaning may also be applicable. Further, it is also possible tomake a movement of the filters 33, 63 and 65 intermittent, or anoccasional reverse rotation or a reverse rotational movement.

Additionally, though the description is given such that the main body ofexhaust cleaning system 15 is assembled in the kitchen system 1, inaddition to cleaning the exhaust air 5 generated during cooking, anykind of exhaust air can be an object of cleaning. For example, when anexhaust air generated during waste treatment, an exhaust air generatedduring crushing and grinding and an exhaust air generated by a kiln,such as a cement clinker, are to be cleaned, the main body of exhaustcleaning system 15 may directly be assembled inside an exhaust duct or astack to clean a contaminated exhaust air passing through the exhaustduct or the stack. Additionally, in the case of assembling in grindingfacilities and fine dust generated during grinding and contained in anexhaust air is removed but a chemical treatment is not required, watermay be used as a cleaning liquid. Further, when an acid gas or a chloricgas is contained, a solution having an action, such as adsorption andneutralization may be used as a cleaning liquid.

Also, when there is no anxiety of contaminants dropping from an outerface of the cleaning liquid tank 2, omitting the collection part 24, themain body of exhaust cleaning system 15 may be provided with a simplecomposition and a compact size facilitating the production.

Next, the second embodiment is described by referring to FIG. 11 throughFIG. 13.

The second embodiment shown in FIG. 11 through FIG. 13 is a compositionin which the exhaust system 6 of the embodiment of FIG. 1 through FIG. 3is made movable.

That is, in FIG. 11 through FIG. 13, a reference numeral 81 is anexhaust system, and the exhaust system 81 is a near box shape with theinlet opening 9 provided in a lower face and has a hood 82 with thedischarge opening 10, to which the fire damper 11 is attached, formed ina near center of an upper face. Also, at the discharge opening 10 of thehood 82, an exhaust duct 84 having a fan 83 is provided to protrude in astack form.

At lower end corners of the hood 82, nearly bar formed expandable legs85 having an axial direction along a vertical direction are provided tobe mounted/dismounted. The leg 85, of which an upper leg part 87 that isattached to the hood 82 via a joint 86 and a lower leg part 89 having aflat placement part 88 in a flange form at a lower end are connectedcoaxially, is formed to be expandable, namely a dimension is variable bythe joint 86.

Also, in the hood 82, a main body of exhaust cleaning system 91 isattached. The main body of exhaust cleaning system 91 does not have thegrease filter 23 in the main body of exhaust cleaning system 15 of theembodiment of FIG. 1 through FIG. 3, and instead it has a main body case94 as a main body having a plural number of nearly circular inlets 93formed by punching a side plate 92.

Further, for use, after moving the exhaust system 81 so as the hood 82to come above a gas fryer 96 to be a combustion system, cookingpreparation and cooking are done like the case of the embodiment of FIG.1 through FIG. 3, namely by igniting the gas fryer 96 and heating afrying oil 97 in the gas fryer 96, fries 98 are cooked. The exhaust air5 generated by cooking is, like the case of the embodiment of FIG. 1through FIG. 3, absorbed into the hood 82 by driving the fan 83, flownfrom the inlet 93 into the main body of exhaust cleaning system 91, andwhile separating and removing relatively contaminant particles, such asaerial dust, cleaned by flowing through a side face part of the filter33, the space 36 and an upper face part of the filter 33, flown throughthe exhaust opening 10 of the fire damper 11 to the exhaust duct 84, anddischarged from an upper part of the exhaust duct 84 into the kitchen 7.Additionally, since the cleaning liquid 40 has a deodoring effect, thecleaned exhaust air 5 to be discharged does not smell so much, therebypreventing a degradation in environment of the kitchen 7 due to anoffensive odor.

According to the second embodiment shown in FIG. 11 through FIG. 13,since the exhaust system 81 providing the main body of exhaust cleaningsystem 91 with legs 85 attached to the hood 82 is movable, it can bemoved properly to cope with a working condition, namely a generation ofthe exhaust air 5 of a combustion system such as the gas fryer 96, andthereby the exhaust air 5 can be cleaned efficiently. Further, wheremultiple combustion systems 4 are provided but cooking is done in oneplace, the hood 82 may be moved to come above the combustion system 4,and since there is no need to provide exhaust systems 6 for each ofthese combustion systems 4, a cost of the kitchen 1 can be reduced.

Also, as the leg 85 is formed expandable, a height can be adjustedaccording to a condition of the generated exhaust air 5 of thecombustion system 4, the gas fryer 96 and the like, the exhaust air 5can be cleaned efficiently, and maintenance operations of the hood 82and the main body of exhaust cleaning system 91 can be made easy.

Further, since the leg 85 is attached to the hood 82 to be freelymounted/dismounted, a volume is small when the leg 85 is not attached, aspace for storage and transportation after production can be saved,disassembling and housing is easily made when not in use, and amaintenance of the main body of the exhaust cleaning system 91 and thelike can easily be made.

Additionally about the embodiment shown in FIG. 11 through FIG. 13,though the description is given based on a construction in which theplacement part 88 is provided at a lower part of the leg 82 and which isplaced on a floor surface, a wheel having a stopper may be providedinstead of the placement part 88. According to this composition, theexhaust system 81 can smoothly be moved and a movability is improved.

Also, an incombustible or noncombustible sheet may be hanged at a loweredge of the hood 82. According to this composition, the exhaust air 5can be cleaned almost completely by the main body of exhaust cleaningsystem 91, preventing a degradation in a kitchen environment, and it ispossible to prevent contaminants remaining in the exhaust air 5 fromdepositing in areas of the kitchen 7. Additionally, to make possible aconfirmation of an internal condition, this sheet is desirablytransmissive with regard to light.

Further, though the leg 85 is attached to the hood 82 in thedescription, when a composition for absorption by the hood 82 is notnecessary because of a condition of the exhaust air 5, the leg 85 maydirectly be attached to the main body case 94 of the main body ofexhaust cleaning system 91.

Next, still the third embodiment of the present invention is explainedby referring to FIGS. 14 and 15.

In the third embodiment shown in FIGS. 14 and 15, the filter 33 of theembodiment of FIG. 1 through FIG. 3 is formed in a disc shape.

That is, a main body of exhaust cleaning system 101 is made of thematerials used for the main body case 18 of the main body of exhaustcleaning system 15 of the embodiment of FIG. 1 through FIG. 3, and has abox-shaped main body case 104 as a main body opened at top and bottomwith a pair of nearly rectangular end plates 102, 102 and a pair ofnearly rectangular stainless steel side places provided at side edges ofthe end plates 102, 102. Additionally, at one end plate 102, a similarinspection hole is provided, and like the embodiment of FIG. 11 throughFIG. 13, side plates 103, 103 are provided with a plural number ofpunched nearly circular inlets 93 that are positioned to form nearlysemi-circular shapes.

At a lower part of the main body case 104, likewise the cleaning liquidsupply/discharge means 48, the collection part 24 and the box-shapedcleaning liquid tank 22, of which an upper face where the trembler 50 ofthe ultrasonic cleaning means 53 is provided is opened, are providedmonolithically.

Also at the side plate 103 of the main body case 104 as a main body, arotary shaft 106 having an axial direction in opposite directions isarranged with both ends held by bearings, not shown in the drawing,provided at the side plates 103, 103. The rotary shaft 106 of which oneend protrudes from the side plate 103 and an end part is connected withthe motor 26 arranged on the outer face side of the side plate 103 so asto be rotated. Further, at both ends of the rotary shaft 106, a pair offilter bodies 107 are provided.

Further, the filter body 107 has an outer periphery 109 having windows108 opened in ring-shaped both end faces, and a filter holding part 111formed in a circular frame shape with reinforcing members 110, 110bridging both edges along a diameter direction. Also, at a center partto be a center of the intersecting reinforcing members 110, 110 of thefilter holding part 111, a metal member 112 with which the rotary shaft106 is engaged is provided. Further, on one face side of the outerperiphery 109, an elastic member 113, such as a rubber part, protrudingin a ring form in an axial direction is provided. Also, in the filterholding part 111, between reinforcing members 110, likewise a nearlydisc-shaped filter 115 made of metal wires, such as stainless steelwires, and gathered in a mat form is held from the window 108, and thusthe filter body 107 is formed.

Further, the filter body 107 is arranged in the main body case 104 so asto be rotated by the motor 26 with a center of the filter body 107 as arotation center, by an arrangement such that an end of the rotary shaft106 is engaged with the metal member 112, and end of the elastic member113 touches the side plate 103 of the main body case 104, and the inlet93 is positioned to face an inside of the elastic member 113. By theelastic member 113 touching an inner face of the side plate 103, theexhaust air 5 flowing into the main body case 104 flows through thefilter 115 of the filter body 107 by way of an inside closed by theelastic member 113. Further, the filter body 107 is positioned at itslower end in the cleaning liquid tank 22 and is immersed in the cleaningliquid 40.

Also, the main body case 104 is at its upper end attached to an upperlower face, by covering the discharge opening 10, and with the exhaustoutlet 20 of an upper face of the main body case 104 connected airtightto the discharge opening 10, and the main body of exhaust cleaningsystem 101 is provided in the hood 8. Further, the exhaust air 5,flowing from the inlet 93 through the filter 115 of the filter body 107,flows through the exhaust duct 14 from the exhaust opening 10 where thefire damper 11 is provided, and is discharged outdoors.

Additionally, a spacing between a pair of filter bodies 107, 107 beingopposed to each other and a dimension of a diameter of the filter body107 are desirably more than a length in the same direction of thedischarge opening 10. That is, if the spacing between the filter bodies107, 107 is narrow, a wind velocity of the exhaust air 5 is acceleratedbetween the filter bodies 107, 107 and the discharge opening 10 comparedwith that while passing through the filter 115 and is sowed down againthe exhaust duct 14, and thereby an air sound maybe generated or theexhaust air 5 may not efficiently be absorbed due to an increase in anabsorption resistance of the exhaust air 5, consequently degrading acleaning efficiency. Therefore, desirably the spacing between theopposing filter bodies 107, 107 and the dimension of the diameter of thefilter body 107 are desirably more than prescribed values.

According to the embodiment of FIGS. 14 and 15, since the filter body107 having the filter 115 is nearly formed as a disc that occupies asmall volume only, a space in the main body case 104 can be formed smalland a compact design is easily applicable.

Further, since the nearly disc shaped filter 107 is rotated, no otherspace is necessary for movement, and thus a compact design is easilyapplicable.

Also, since a pair of nearly disc shaped filter bodies 107, 107 can berotated by one rotary shaft 106, the filter bodies 107, 107 can easilybe moved with a simple composition, a simplification and compacting ofthe main body of the exhaust cleaning system 101 can be made easily, andproductivity can also be improved.

Further, since mat-shaped filter 115 is held by the filter holding part111 and is formed in a near disc shape, the filter 115 is free fromloosening and can be rotationally moved easily and surely.

Also, since the elastic member 113 for passing the exhaust air 5 to thefilter 115 is provided at the filter holding part 111, it is possible toflow the exhaust air 5 easily and surely to the filter 115, withoutcausing leakage, and the exhaust air 5 can be cleaned efficiently.

Additionally, in above-mentioned embodiment of FIGS. 14 and 15, a pairof opposing filter bodies 107, 107 are borne by one rotary shaft 106,but the filter bodies 107, 107 can also be held in intersecting axialdirections, namely so as opposing faces expand upward, to freely rotate.

Also, the filter body 107 can also be arranged with one piece instead oftwo pieces, as shown in FIGS. 9 and 10, and further, it may be arrangedwith plural pieces so as they are superposed or radially oppose.Additionally, when only one piece is provided, a space to arrange thefilter body 107 can be saved, and thereby a compact, lightweight systemfor home use can be provided, and productivity can also be improved.Also, when plural pieces are superposed, the exhaust air 5 passesthrough the filter 115 more than once, and a cleaning performance of theexhaust air can be improved.

Further, it is also possible to provide the elastic member 113 providedat the filter body 107 and a roller at the side plate 103 so as theirends adhere to the filter body 107.

Next, still forth embodiment of the exhaust cleaning system according tothe present invention is described by referring to FIG. 16.

In the forth embodiment shown in FIG. 16, a filter 120, namely theendless-belt-formed filter 33 of the embodiment of FIG. 1 through FIG. 3is formed as a band. That is, like the filter 33 of the embodiment ofFIG. 1 through FIG. 3, the filter 120 having a flexibility is formed asa band by gathering metal wires, and both ends of the filter 120 in alength direction are positioned in the cleaning liquid tank 22 and fixedto rotary shafts 121a, 121a that are provided to freely rotate, and thefilter 120 is spanned to rotary shafts 121b, 121b located upward so asto fully cover the discharge opening 10, so that the filter 120 performsa parallel movement, namely the filter 120 is wound up as a shutter whenone rotary shaft 121a rotates and a portion wound up by the other rotaryshaft 121a is unwound.

According the a composition of a main body of exhaust cleaning system122 shown in FIG. 16, it is possible to pass the exhaust air 5 more thanonce even if the filter 120 is not formed in a tubular shape, so that acompact design is easily applicable.

Also, since the filter 120 has ends, it can easily be spanned to therotary shafts 121a, 121b without causing a sag and can easily bemounted/dismounted, and a maintainability can be improved.

Additionally, the filter 120 is formed as a windable belt shape like ashutter in the embodiment of FIG. 16, but as shown in FIGS. 17 and 18,it is also possible, for example, to form a filter body 125monolithically and the filter body 125 may be moved in parallel.

That is, the nearly tubular filter body 67 of the embodiment shown inFIGS. 5 and 6, and the endless-belt shaped filter 33 is held in a tiltedcondition by the filter holding part 126 so as both ends in axialdirections extend in the same direction, thereby forming the filter body125 as a monolithic structure. Then, so as the filter body 125 of itstilted parts on both sides extend downward, a main body case 127 as amain body is arranged inside and is moved in parallel toward the tiltedparts, so that a main body of exhaust cleaning system 128 that canimmerse and clean the filter body in the cleaning liquid 40 with thedischarge opening 10 closed may be formed.

Next, still forth embodiment of the present invention is described byreferring to FIG. 19.

In the fifth embodiment shown in FIG. 19 is a composition in which,instead of a process to immerse and clean the filter 33 in the cleaningliquid 40 in the cleaning liquid tank 22 of the embodiment shown in FIG.1 through FIG. 3, the filter 33 is cleaned by contact with the cleaningliquid 40, namely by injection.

That is, an injection means 131, such as a pump for pressure-feeding thecleaning liquid 40 is connected to the tank 41 storing the cleaningliquid 40, and an injection tube 133 having a nozzle 132, as aninjection part, is attached at a top of the injection means 131. Then,arranging the nozzle 132 so as to face the filter 33, caughtcontaminants are cleaned and separated by injecting the cleaning liquid40 to the filter 33.

Here, a cleaned effluent is collected into the cleaning liquid tank 22and circulated again to the injection means 131.

According to the composition of the main body of exhaust cleaning system135 shown in FIG. 19, there is no anxiety of noise due to ultrasoniccleaning being generated.

Also, since the nozzle 132 is arranged in the cleaning liquid tank 22and the injected cleaning liquid 40 is collected by the cleaning liquidtank 22 located downward, it is easily possible to collect the exhaustliquid 40 while cleaning the exhaust air 5 with a simple composition.

Additionally, even when the cleaning liquid 40 is injected in a mistform from the nozzle 132, the cleaning liquid 40 is collected by thefilter 33 at its part adhering to the discharge opening 10 and is notabsorbed into the exhaust duct 14, so that a soil in the exhaust duct 14can be prevented. Further, by positioning the nozzle 132 so as to beimmersed in the cleaning liquid 40 stored in the cleaning liquid tank22, the injected cleaning liquid 40 does not form a mist and does notsoil peripheral areas.

Also, since the cleaning liquid 40 is injected from an upstream side ina direction along which the exhaust air 5 flows, namely on a front sideof the filter 33, even if the cleaning liquid 40 flies in a mist form,it is scarcely caught by and flows through the filter 33, so that otherparts are not soiled, a collection of the cleaning liquid 40 is easy,and an arrangement of the nozzle 132 and an assembling of the filter 33can easily be made.

Further, since the cleaning liquid 40 is injected, a kinetic energy ofinjection also adds a physical cleaning power.

Additionally, though the cleaning liquid 40 is injected in thedescription, it may be flown down from an upper part so as to contactthe filter 33.

Also, for example, the nozzle 132 as an injection part may be formed asa tube-shaped injection part having a length direction along a directionhorizontal to a plain of the filter 33 and an injection outlet forinjecting the cleaning liquid 40 to a face opposing the filter 33, wherethe tube-shaped injection part is at both ends held by a rail to movealong a plain of the filter 33, so that the cleaning liquid 40 issupplied to the injection part and the filter 33 is cleaned by themoving injection part.

INDUSTRIAL APPLICABILITY

As described above, the present invention can be used for the exhaustcleaning system which are clarified and discharged an exhaust aircontaining oily steam and dust generated from the kitchens used at foodsupply facilities of hotels, restaurants, Tempura restaurants andYakitori restaurant and home ventilation fans, and exhaust aircontaining contaminants generated from incineration facilities at wasteincineration plants, crushing facilities of quarries and a clinkercalcination facilities of cement plants. According to the presentinvention, since an exhaust air flowing from an inlet into a main bodyis flown through a permeable filter moving inside the main body and isdischarged from an exhaust outlet of the main body, contaminants in theexhaust air are caught, separated and removed, and the caughtcontaminants are washed off by a cleaning means while changing aposition of the filter moved by a moving means, cleaning operations canbe nearly automated, the exhaust air can be cleaned efficiently.

What is claimed is:
 1. An exhaust clean system characterized byprovision for;a main body having an exhaust inlet into which an exhaustair flows and an exhaust outlet from which said exhaust air isdischarged; a permeable filter, provided in the main body, for passingsaid exhaust air that flows in from said exhaust inlet and dischargingthe same from said exhaust outlet; a cleaning means for cleaning atleast a part of the filter by an incombustible and vegetable cleaningliquid; and a moving means for moving said filter to change a cleaningposition of said filter to be cleaned by said cleaning means.
 2. Anexhaust cleaning system characterized by comprising a main body havingan exhaust inlet into which an exhaust air flows and an exhaust outletfrom which said exhaust air is discharged;a permeable filter, providedin the main body, for passing said exhaust air that flows in from saidexhaust inlet and discharging the same from said exhaust outlet; acleaning means for cleaning at least a part of the filter by a cleaningliquid containing a main component of amine soap made from tallol oil asa material and a higher alcoholic nonionic surfactant, and a movingmeans for moving said filter to change a cleaning position of saidfilter to be cleaned by said cleaning means.
 3. An exhaust cleaningsystem according to claim 1 or 2, wherein said cleaning means isprovided with an injection unit for injecting the cleaning liquid atleast to a part of the filter.
 4. An exhaust cleaning systemcharacterized by provision for;a main body having an exhaust inlet intowhich an exhaust air flows and an exhaust outlet from which said exhaustair is discharged; a permeable filter provided in the main body coveringsaid exhaust outlet, a cleaning means for storing an incombustible,vegetable cleaning liquid to immerse at least a part of the filter; anda moving means for moving said filter to change a cleaning position ofsaid filter to be cleaned by said cleaning means.
 5. An exhaust cleaningsystem characterized by provision for;a main body having an exhaustinlet into which an exhaust air flows and an exhaust outlet from whichsaid exhaust air is discharged; a permeable filter provided in the mainbody covering said exhaust outlet, a cleaning means for storing acleaning liquid containing a main component of amine soap made fromtallol oil as a material and a higher alcoholic nonionic surfactant toimmerse at least a part of the filter, and a moving means for movingsaid filter to change a cleaning position of said filter to be cleanedby said cleaning means.
 6. An exhaust cleaning system according to any aone of claims 1, 2, 4, or 5, wherein said moving means moves the filterin the condition of covering the exhaust outlet.
 7. An exhaust cleaningsystem according to any one of claims 1, 2, 4, or 5, wherein saidexhaust air passes through the filter at least twice.
 8. An exhaustcleaning system according to any one of claims 1, 2, 4, or 5, whereinsaid filter is formed as an endless belt.
 9. An exhaust cleaning systemaccording to any one of claims 1, 2, 4, or 5, wherein said filter isformed in a nearly tubular shape having a space inside.
 10. An exhaustcleaning system according to any one of claims 1, 2, 4, or 5, whereinsaid moving means has a filter holding part for holding the filter and adriving means for moving the filter holding part.
 11. An exhaustcleaning system according to any one of claims 1, 2, 4, or 5, whereinsaid moving means rotationally moves the filter.
 12. An exhaust cleaningsystem according to any one of claims 1, 2, 4, or 5, wherein said movingmeans is provided with a frame-like filter holding part for holding thefilter and a driving means for moving rotationally the filter holdingpart.
 13. An exhaust cleaning system according to any one of claims 1and 3 inclusive, 2 and 3 inclusive, 4, or 5, wherein said cleaning meansis provided with an ultrasonic cleaning means for ultrasonicallycleaning the filter immersed in the cleaning liquid.
 14. An exhaustcleaning system characterized by provision for;a main body having anexhaust inlet into which an exhaust air flows and an exhaust outlet fromwhich said exhaust air is discharged; a permeable filter, provided inthe main body, for passing said exhaust air that flows in from saidexhaust inlet and discharging the same from said exhaust outlet; acleaning means having an injection unit for cleaning said filters byinjecting an incombustible, vegetable cleaning liquid at least to a partof the filters; and a moving means for moving said injection unit ofsaid cleaning means to change a cleaning position of said filter to becleaned by said cleaning means.
 15. An exhaust cleaning systemcharacterized by provision for;a main body having an exhaust inlet intowhich an exhaust air flows and an exhaust outlet from which said exhaustair is discharged; a permeable filter provided in the main body, forpassing said exhaust air that flows in from said exhaust inlet anddischarging the same from said exhaust outlet; a cleaning means having ainjection unit for cleaning said filter by injecting at least to a partof the filter a cleaning liquid containing a main component of aminesoap made from tallol oil as a material and a higher alcoholic nonionicsurfactant, and a moving means for moving said injection unit of saidcleaning means to change a cleaning position of said filter to becleaned by said cleaning means.
 16. An exhaust cleaning system accordingto any one of claims 1 and 3 inclusive, 2 and 3 inclusive, 14 or 15 andcharacterized by an injection unit for injecting a cleaning liquid fromthe upper side of flowing direction of the exhaust air to the filter.17. An exhaust cleaning system according to any one of claims 2, 5, or15, wherein said cleaning liquid is incombustible, and vegetable.
 18. Anexhaust cleaning system according to any one of claims 1, or 2, or 1 and3 inclusive, or 2 and 3 inclusive, or 4, or 5, or 1, 3 and 13 inclusive,or 2, 3 and 13 inclusive, or 14, or 1, 3 and 16 inclusive, or 2, 3 and16 inclusive, or 14 and 16 inclusive, or 15 and 16 inclusive, whereinsaid cleaning liquid contains a main component of amine soap made fromtallol oil as a material and a higher alcoholic nonionic surfactant. 19.An exhaust cleaning system according to any one of claims 1, 2, 4, 5,14, or 15, wherein said filter has flame retardant, or incombustible,and anticorrosive properties.
 20. An exhaust cleaning system accordingto any one of claims 1, or 2, or 4, or 5, or 14, or 15, or 1 and 19inclusive, or 2 and 19 inclusive, or 4 and 19 inclusive, or 5 and 19inclusive, or 14 and 19 inclusive, or 15 and 19 inclusive, wherein saidfilter is formed with at least either of gathered slender metal wiresand gathered slender metal thin sheets.
 21. An exhaust cleaning systemaccording to any one of claims 1, or 2, or 4, or 5, or 14, or 15, or 1and 19 inclusive, or 2 and 19 inclusive, or 4 and 19 inclusive, or 5 and19 inclusive, or 14 and 19 inclusive, or 15 and 19 inclusive, or 1, 19and 20 inclusive, or 2, 19 and 20 inclusive, or 11, 19 and 20 inclusive,or 5, 19 and 20 inclusive, or 14, 19 and 20 inclusive, or 15, 19 and 20inclusive, wherein said filter is formed with stainless steel.
 22. Anexhaust cleaning system according to any one of claims 1, 2, 4, 5, 14 or15, wherein said main body has a leg part that mounts the main body tomove on a floor surface.
 23. An exhaust cleaning system according to anyone of claims 1, 2, 4, 5, 14 or 15, wherein said cleaning means isprovided with a cleaning liquid supply/discharge means for supplying anddischarging a cleaning liquid.
 24. An exhaust cleaning system accordingto any one of claims 1, 2, 4, 5, 14 or 15, wherein said filter iscovered with a flow restricting body having flow holes that do not allowlinearly flow of exhaust air.
 25. An exhaust cleaning system accordingto any one of claims 1, 2, 4, 5, 14 or 15, wherein said cleaning meanshas a receiving tank, with plane area equal to or exceeding that of thefilter and arranged underneath said filter.
 26. An exhaust cleaningsystem according to any one of claims 1, 2, 4, 5, 14 or 15, wherein saidmain body is equipped with a fire detection means for detecting fire anda shutter body for closing the exhaust outlet.